1308221 has 2 divisors, whose sum is σ = 1308222. Its totient is φ = 1308220.

The previous prime is 1308193. The next prime is 1308247. The reversal of 1308221 is 1228031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 376996 = 965^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1308221 - 2⁶ = 1308157 is a prime.

It is a super-2 number, since 2×1308221² = 3422884369682, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1308221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1308121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654110 + 654111.

It is an arithmetic number, because the mean of its divisors is an integer number (654111).

2^1308221 is an apocalyptic number.

It is an amenable number.

1308221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1308221 is an equidigital number, since it uses as much as digits as its factorization.

1308221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1308221 is about 1143.7748904395. The cubic root of 1308221 is about 109.3688650709.

The spelling of 1308221 in words is "one million, three hundred eight thousand, two hundred twenty-one".